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HeatShield Cerfractory Foam is a hybrid (ceramic/ refractory) coating that is applied with a specially designed sprayer to coat the walls of smoke chambers. It expands up to 50% of its volume as it cures. After expansion it dries rock hard to form closed cell air pockets that insulate and seal gaps, cracks, and holes in your smoke chamber. Finally, it seals gaps, cracks, and smooths up any jagged and corbelled brick edges, making fireplaces safer and more efficient.